#4 Alen Halilovic
Signed in May 2014 for a minimal fee of €2.2 million, 18-year-old Alen Halilovic was the subject of gossip, thanks to his silky dribbling abilities and garnered comparisons to Lionel Messi. He was expected to carry on the tradition as Barca's talisman in the future but sadly left the club after two years in 2016.
A wide attacking midfielder, the Croatian prodigy found himself miles behind the MSN trio, who were wreaking havoc in Europe at the time. In order to grant him playing time, Barca loaned him out to Sporting Gijon for a season. The following year, Luis Enrique deemed it fit to sell him to Hamburg.
The player, who once showed promise and flashes of his exciting talent, is currently playing at Las Palmas on loan from Hamburg aged 21. Barca had inserted a buy-back clause in his transfer deal but they look far from activating it in the near future.